Interesting - I didn't think the X had the ability to "read" the key unless it was actually in the ignition. Are you sure? Have you tried the system without the key being in the car? I certainly could be wrong as I'm learning new things about my X all the time, but this doesn't make sense to me as the X doesn't have any features (like auto unlock when you approach and push-button start) that would make use of this feature...

In any case, I believe there are systems available that don't require this, but the manual says not to start the car and let it idle - it says to drive off right away. I'm not sure I buy that as I can't imagine that the "fluid" systems don't have the ability to protect the engine if the car's not moving...